Demountable rim



Aug.` l2 1924.

H. R. ROFFMANN DEMOUNTABLE RIM 1922 2 Sheets-Sheet l Filed Sept. 2

wve'noz l llfarold jloffmann Aug. 12 1924. 1,504,509

H. R. ROFFMANN DEMOUNTABLE RIM Filed Sept. 2, '1922 2 Sheets-Sheet 2 l llllllllmllll l l Innen *oz Hamid ,Roffm ann Hanonn n. nostra/rami', or nnvv Yoan, u. Y;

DEMUNTABLE Rllfi.

Application filed September To all whom it may cof/werp.'

Be it known that l, HAROLD R. HOFFMANN, citizen of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Demountable Rims, of which the following is a speciication.

This invention relates to a demountable rim and particularly to a construction oomprising pivoted :toldable segments adapted to collapse the rim when desired.

The invention has for an object to provide` a novel and improved construction wherein the abutting rim ends are interlocked and a toggle member disposed over such ends for the purpose of expanding the rim and lock- -ing the same in such position.

A further object of the invention is to present a new construction of toggle member in which broad substantial plvots are formed integral therewith and the structure materially simplified, strengthened and lreduced in cost of production.,

Another object of the invention is to provide an improved pivotal connection between the segments comprising an'elongated slot and tongue pivot and an interlocking co'ntact at the side walls of the rim.

Other and further objects and advantages of the invention will be hereinafter set forth and the novel features thereof defined by the appended claims.

ln the drawings- Figure 1 is a si applied to a wheel and tire;

Figure 2 is a similar view of the rim colla sed, with one-joint in section;

igure 3 is a detail perspective of the pivot between the segments;

Figure 4 is a detail plan ot' the toggle; Figure 5 is a longitudinal section thereof; Figure 6 is a detail perspective of the y toggle partially collapsed; .45.

Vde elevation of the rima, iena. serial no. estese.

comprises a lug 12 extended from one segment and passing through an elongated slot 13 in the abutting segment, the lug being curved or bent so as to remain in the slot when the segments are collapsed and thus prevents separation thereof. The side walls 14 of the rim segments are also interlocked by a tongue 15 upon one segment entering va groove or recess 16 upon the connected 65 segment. As shown by section in Figure 2,' and also in Figure 3, the folding segments are always connected to the main segment.

The abutting end ofv one of the folding segments is provided with a dovetailed ex- '70 tension 17 adapted to enter a corresponding recess 18 in the abutting segment, while the meeting side walls of the segments are formed with a curved overlapping portion '19 as indicated in Figures 4 and 5.- Above 75 4 this interlocked joint, a toggle device is disposed and consists of the -plates 20 and 21. The former is provided at one end with a pivoting bar 22 which enters a slot 23 in the rim and is held in position by .a plate 24 8@ secured to the segment to overlap the barv head and embrace the neck 25 thereof, as shown in Figure 7 The toggle plates are pivoted together by means of a slot 26 in the member 2O @5 which receives a ll"liead 27 upon the plate 21, the parts being secured to prevent disconnection by 'turning over the end of the plate 20, as at 28, 'to ,embrace the head 27,

as shown by Figure 8. rlhe opposite end of 90 the plate 21 isv angularly disposed to form a foot 29 which enters a slot 30 in the seg- 'ment, and in the expanding action bears against a wall thereof.- This foot is readily disconnected from the slot when the seg 95 ments are collapsed.

- ln the operation of the invention with the parts collapsed as in Figure 2, the segments are opened to the dotted line position and theioot of the toggle engaged with the slot,

as shown in Figure 6. Pressure is then applied by the operator to the toggle plates which expands the' rim, causing the ends of the. loldn segments to interlock automatically, an 'when the toggle reaches the 05 position shown 1n Figures 4 and' theparts are firmly locked. The use of toggle plates provides a'wide substantial bearing for the operator-s foot in applying pressure to expand the rim, and the formation of the bear 110 ing heads upon the plates produces a broad rm bearing not liable to side play or accidental injury which frequently occurs when bearing lugs and pivot pins are used. The construction embodies both simplicity and economy in construction as it provides for the formation of the toggle pivots upon these members and only requires the use of slots in the segments, thus effecting the maximum strength and rigidity in the rim. It will be noted that the circumferential .strain is carried by the interlocked ends of the segments and the toggle only acts to expand orcollapse these members and does not orm a section of the rim. This same rigid bearing between the main and folding segments is secured through the pivotal and interlockedconnections there provided. While the specific details of the invention .have been shown and described it is not confined thereto as recited in the following claims.

What I claim is- 16 A tire rim comprising pivoted segments each provided with an aperture adjacent its free end, and toggle members formed with a head secured in the aperture of one segment to provide a iiXed pivot and a foot -to detachably interlock with the aperture in 3. A tire rim comprising pivoted segments each provided with an aperture adjacent its free end, a toggle member having a pivot head at one end to enter one of said apertures and a plate at its opposite end, a cooperating toggle' member having a pivot head to enter` free end, a to gle member having a pivot head at one en to enter one of said apertures and a slot at its opposite end, a plate secured to the segment to retain said head in position, a. cooperating toggle member having a pivot head to enter said slot and an angularly disposed'foot to engage the other segment aperture, and a bent portion upon the first mentioned toggle member to retain said last mentioned pivot head in positione 5. A tire' rim comprising pivoted segments each having a transverse slot adjacent its free end, a toggle member having aT-head at one end to enter one of said apertures and a slokt at its opposite end, a plate secured to the segment to embrace the neck of said head, a cooperating toggle member having a T-head to enter the last mentioned slot and an angularly disposed foot to engage the other segment aperture, and an over-bent. free end of the rst mentioned toggle meinber to embrace the neck of the last mentioned T-head..

In testimony whereof I aliix my signature.

HAROLD n. Ynorrimim. 

